Pipe-wrench



(No Model.) I

R. J. ROBBINS.

PIPE WRENCH.

No..416,500. Patented Dec. 3, 1889.

Pnnwmmmpnur. wnhmmun. D4 c UNITED STATES PATENT OEEIcE.

RICHARD J. ROBBINS, OF SUSPENSION BRIDGE, ASSIGNOR OF TlVO-TIIIRDS TO CORNELIUS IV. GRAHAM AND EDVARD T. SMITH, BOTH OF BUFFALO,

NEIV YORK.

PIPE-WRENCH.

SPECIFICATION forming part of Letters Patent No. 416,500, dated December 3, 1889.

Application filed July 17, 1889. Serial No. 317,766. (No model.)

To all whom t1/nay concern: l

Be it known that I, RICHARD J. RoBBrNs, a citizen of the UnitedStates, residing at Suspension Bridge, in the county of Niagara and State of New York, have invented new and useful Improvements in Pipe-Wrenches, of which the following is a speciiication.

This invention relates to that class of pipewrenches which consist of a main lever pro- 1o vided with a fixed jaw and a movable jaw pivoted to the m'ain lever and provided With an auxiliary lever, whereby the movable jaw is actuated for clamping the pipe or other article to be turnedbetween the biting-faces of the two jaws. l

The object of my invention is to construct a simple and powerful wrench of this kind which can be readily adjusted to grasp pipes of diiferent sizes, and which will permit the 2o pipe to be turned in either direction without changing the position of the wrench upon the plpe.

The invention consists of the improvements which will be hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure l is y a side elevation of my improved wrench, showing the jaws closed. Fig. 2 is a plan view thereof. Fig. 3 is a side elevation showing 3o the jaws released.

Like letters of reference refer to like parts in the several iigures.

A represents the main leverof the wrench, provided at one end with a iixed jaw B, hav- 3 5 ing serrated or biting faces b b', arranged at right angles, or nearly so, with each other.

C represents the movable jaw pivoted to the lever A by a pin or bolt c. The jaw C is provided with two serrated or biting faces c 4o c2, arranged at right angles, or nearly so, with each other and facing the biting-faces of the iixed jaw B.

The movable jaw O is preferably composed of two plates O', which are pivoted to opposite sides of the lever A. By constructing the movable jaw in two parts and arranging these parts on opposite sides of the iixed jaw the latter is permitted to enter the space between the two parts of the movable jaw when the jaws are closed together, which enables o the jaws to take a rm hold or grip upon pipes of Very small size. lThe plates O of the movable jaw are provided with arms or extensions CZ, which project rearwardly from the pivot c and are connected by a pin or bolt e, whereby the plates O of the movable jaw are caused to move together.

F represents an auxiliary lever, which is supported on the main lever and connected with the movable'jaw for actuating the same. 6o This auxiliary lever is provided at its inner end with a cam f, which rests upon the upper edge of the lever A. The inner end of the auxiliary lever is connected with the arms CZ of the movable jaw by links g, which, being arranged on both sides of the main lever, hold the auxiliary lever in place on the same.

The movable jaw is moved toward and A from the 'fixed jaw by sliding the auxiliary lever backward and forward upon the main 7o lever.

When the wrench is applied to a pipe, the jaws are brought in contact with opposite sides of the pipe by sliding the auxiliary lever backward on the main lever, the auxiliary lever being held with its free end away from the main lever, as indicated in Fig. 3. When the auxiliary lever has been moved backward on the main lever far enough to bring the jaws in contact with the pipe, the 8o longitudinal movement of the auxiliary lever on the main lever'is stopped and the auxiliary lever is turned toward the main lever,

the cam of the auxiliary lever forming the fulcrum on which it turns. This turning movement of the auxiliary lever causes the jaws to close upon the pipe and to take a irm hold of the same. The movement which is produced in the movable jaw by sliding the auxiliary lever on the main lever is 'compara- 9o tively large, and this movement is utilized for adjusting the jaws to the pipe. The

`movement which is produced in the movable j aw by turning the auxiliary lever is comparatively small, but correspondingly powerful, so that a firm grip is obtained on the pipe without danger of crushing the pipe by an excessive movement of the movable jaw ton ward the iixed jaw. The pipe is held firmly between the jaws and can be turnedin either direction when the grip is not released; but when the pipe is to be turned in one particular direction the grip of the jaws is released during the backward stroke of the wrench by swinging the auxiliary lever away from the main lever. The cani f is provided with serrations 71 and the portion of the upper edge or face of the lever A upon which the cam f rests is provided with similar sei-rations 7L', which engage with the Serrations on the cam, and whereby the latter is prevented from slipping on the main lever when the auxiliary lever is turned.

I represents a link which surrounds the main and auxiliary levers, and which is free to slide forwardly and backwardly thereon. By moving' the link outwardly on the levers until the jaws are iirmly closed against the pipe the jaws are locked in this position and the hand of the operator is relieved from the strain of holding` the jaws closed.

I claim as my inventionl. The combination, with the main lever provided with a fixed jaw anda movable jaw pivoted to the main lever, of an auxiliary lever adapted to be moved lengthwise on the main lever and provided at its inner end with a serrated cam which bears against the main lever, and links connecting the cam of the auxiliary lever with the movable jaw, substantially as set forth.

2. The combination,with themain lever, provided with a fixed jawand a movable jaw pivoted to the main lever and provided with arms or extensions projecting,r rearwardly from its pivot, of an auxiliary lever provided at its inner end with a cam whichbears against the main lever, and links connecting the arms of the movable jaw with the .inner end of the auxiliary lever, whereby the movable jaw is actuated for grasping the article to be turned between the jaws by pressing the auxiliary lever against the main lever, substantially as set forth.

3. The combination, with the main leverA, provided with a fixed jaw B, having two bitingfaees Z1 D', arranged at an angle to each other, and a movable jaw C, composed of two plates C', pivoted to opposite sides of the lever A and each provided with two biting-faces c c2, arranged at an angle to each other and opposite the faees of the fixed jaw, of arms d, formed on the plates C of the movable jaw and proj ectiug rearwardlyfrom the pivot of the movable jaw, an auxiliary lever F,provided at its inner end with a eamf, which rests upon the main lever, and links g g, connecting,r the inner end of the lever l? with the arms d of the movable jaw, substantially as set forth.

lWitness my hand this 9th day of July, i889.

RTCII'ARD J'. ROBBINS. Witnesses:

JN0. J. BONNER, lf. C. GEYER. 

